Art. 1415 is used to branch up to 4 internal units on the riser (with a different address for each output) and also acts as a line protection, isolating the branches in the event of power surges or short circuit. This unit can be used with systems with Simplebus 2 and Simplebus Color wiring, and as it is powered by the 2 wire bus it does not need any additional power supply. Max. 100 users can be connected to each Mixer Art. 4888U or Art. 4888CU whatever the number of Art. 1415 used, and max. 3 internal units can be connected in cascade for each output of Art. 1415.